Triple phase boundary augmentation in hierarchical, Pt grafted N-doped mesoporous carbon nanofibers for high performance and durable PEM fuel cells

Abstract

Pt-grafted, hierarchical mesoporous carbon nanofibers (Pt/MPCNFs) electrocatalysts have been developed using electrospinning for high-performance PEM fuel cells.

Tailored Hollow Core/Mesoporous Shell Carbon Nanofibers as Highly Efficient and Durable Cathode Catalyst Supports for Polymer Electrolyte Fuel Cells

“…Pt supported on mesoporous, hollow carbon nanofibers were prepared by co‐axial electrospinning and thermally induced selective phase separation method. The introduction of mesoporosity and carbonization were performed for based on our previous report ,. After co‐axial electrospinning, the as‐spun PAN‐NaHCO 3 /PMMA core‐shell nanofibers were stabilized in air at 290 °C for 2 h. During oxidative stabilization, the linear PAN molecules dissociate two hydrogen atoms in the monomeric unit that forms a double bond between the carbon atoms.…”

“…As shown in Figure d, the limiting current density for the oxygen reduction reaction proportionally increases as the rotational velocity of the electrode increases. The kinetic parameters at different rotation speeds was carefully evaluated based on the following Koutecky‐Levich (K−L)Equation (5) and (6), the slopes of the best linear fit lines were used to calculate the electron transfer number (n) per oxygen molecule in the ORR process. …”

“…Meanwhile, the electrochemical performance of carbon nanofibers can be improved by the introduction of porous structure that can eventually facilitate the uniform dispersion of catalyst nanoparticles, charge transfer at electrode‐electrolyte interface and efficient mass transport due to their high surface area, high pore volume, adjustable pore sizes, and good electrical conductivity, resulting in excellent electrocatalytic activity . The mesoporous network in the support material have strong influence on high specific surface area, optimal pore size (2–50 nm) and large pore volumes that can contribute in the enhancement of electrocatalyst particle distribution, mass transport and ionomer contact ,,,,. Generally, two major methods have been adopted for preparing electrospun porous carbon nanofibers i. e., sacrificial component methods and activation methods.…”

Controlled Carbon Doping in Anatase TiO2 (101) Facets: Superior Trace‐Level Ethanol Gas Sensor Performance and Adsorption Kinetics

“…[42] Similarly, the peaks appeared at 285.67 and 288.72 eV for C 40 -TiO 2 showed enlarged peak area, which can be assigned to CO (carbonate-like species) and formation of TiOC (interstitial carbon in the TiO 2 lattice) bonds, respectively. [42] Similarly, the peaks appeared at 285.67 and 288.72 eV for C 40 -TiO 2 showed enlarged peak area, which can be assigned to CO (carbonate-like species) and formation of TiOC (interstitial carbon in the TiO 2 lattice) bonds, respectively.…”

“…[31][32][33][34] On the other hand, another part of localized C 2p is lying in the gap near to Fermi level. [31,32,34,42,43] To satisfy the requirement of charge equilibrium, the oxygen vacancies must have Ti 3+ species in C 40 -TiO 2 , thereby the surface oxygen vacancies are formed on TiO 2 surface. Localized mid-gap states have been generated due to the carbon doping which leads to the increase of work function in TiO 2 lattices.…”